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/*
* I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature
* sensor, ADC and DAC
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include "adt7316.h"
/*
* adt7316 register access by I2C
*/
static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
{
struct i2c_client *cl = client;
int ret = 0;
ret = i2c_smbus_write_byte(cl, reg);
if (ret < 0) {
dev_err(&cl->dev, "I2C fail to select reg\n");
return ret;
}
ret = i2c_smbus_read_byte(client);
if (ret < 0) {
dev_err(&cl->dev, "I2C read error\n");
return ret;
}
return 0;
}
static int adt7316_i2c_write(void *client, u8 reg, u8 data)
{
struct i2c_client *cl = client;
int ret = 0;
ret = i2c_smbus_write_byte_data(cl, reg, data);
if (ret < 0)
dev_err(&cl->dev, "I2C write error\n");
return ret;
}
static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
{
struct i2c_client *cl = client;
int i, ret = 0;
if (count > ADT7316_REG_MAX_ADDR)
count = ADT7316_REG_MAX_ADDR;
for (i = 0; i < count; i++) {
ret = adt7316_i2c_read(cl, reg, &data[i]);
if (ret < 0) {
dev_err(&cl->dev, "I2C multi read error\n");
return ret;
}
}
return 0;
}
static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
{
struct i2c_client *cl = client;
int i, ret = 0;
if (count > ADT7316_REG_MAX_ADDR)
count = ADT7316_REG_MAX_ADDR;
for (i = 0; i < count; i++) {
ret = adt7316_i2c_write(cl, reg, data[i]);
if (ret < 0) {
dev_err(&cl->dev, "I2C multi write error\n");
return ret;
}
}
return 0;
}
/*
* device probe and remove
*/
static int __devinit adt7316_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct adt7316_bus bus = {
.client = client,
.irq = client->irq,
.irq_flags = IRQF_TRIGGER_LOW,
.read = adt7316_i2c_read,
.write = adt7316_i2c_write,
.multi_read = adt7316_i2c_multi_read,
.multi_write = adt7316_i2c_multi_write,
};
return adt7316_probe(&client->dev, &bus, id->name);
}
static int __devexit adt7316_i2c_remove(struct i2c_client *client)
{
return adt7316_remove(&client->dev);
}
static const struct i2c_device_id adt7316_i2c_id[] = {
{ "adt7316", 0 },
{ "adt7317", 0 },
{ "adt7318", 0 },
{ "adt7516", 0 },
{ "adt7517", 0 },
{ "adt7519", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);
#ifdef CONFIG_PM
static int adt7316_i2c_suspend(struct i2c_client *client, pm_message_t message)
{
return adt7316_disable(&client->dev);
}
static int adt7316_i2c_resume(struct i2c_client *client)
{
return adt7316_enable(&client->dev);
}
#else
# define adt7316_i2c_suspend NULL
# define adt7316_i2c_resume NULL
#endif
static struct i2c_driver adt7316_driver = {
.driver = {
.name = "adt7316",
.owner = THIS_MODULE,
},
.probe = adt7316_i2c_probe,
.remove = __devexit_p(adt7316_i2c_remove),
.suspend = adt7316_i2c_suspend,
.resume = adt7316_i2c_resume,
.id_table = adt7316_i2c_id,
};
static __init int adt7316_i2c_init(void)
{
return i2c_add_driver(&adt7316_driver);
}
static __exit void adt7316_i2c_exit(void)
{
i2c_del_driver(&adt7316_driver);
}
MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and"
"ADT7516/7/8 digital temperature sensor, ADC and DAC");
MODULE_LICENSE("GPL v2");
module_init(adt7316_i2c_init);
module_exit(adt7316_i2c_exit);
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